The sane-net library implements a SANE (Scanner Access Now Easy) back-
end that provides access to image acquisition devices through a network
connection. This makes it possible to control devices attached to a
remote host and also provides a means to grant users access to pro-
This backend expects device names of the form:
Where host is the name (or IP address) of the (remote) host and device
is the name of the device on this host that should be addressed. If
the device name does not contain a colon (:), then the entire string is
treated as the device string for the default host. The default host is
the host listed last in the configuration file (see below).
An IPv6 address can be specified enclosed in square brackets:
The net.conf file contains both backend options and a list of host
names (or IP addresses) that should be contacted for scan requests.
Anything that isn't one of the options listed below will be treated as
an host name.
connect_timeout = nsecs
Timeout (in seconds) for the initial connection to the saned
server. This will prevent the backend from blocking for several
minutes trying to connect to an unresponsive saned host (network
outage, host down, ...). The environment variable SANE_NET_TIME-
OUT can also be used to specify the timeout at runtime.
Empty lines and lines starting with a hash mark (#) are ignored. Note
that IPv6 addresses in this file do not need to be enclosed in square
brackets. A sample configuration file is shown below:
# this is a comment
The above list of hosts can be extended at run-time using environment
variable SANE_NET_HOSTS. This environment variable is a colon-sepa-
rated list of hostnames or IP addresses that should be contacted in
addition to the hosts mentioned in the configuration file. For exam-
ple, a user could set the environment variable to the string:
To request that hosts new.scanner.com , [::1] , 192.168.0.2 and scan-
ner.univ.edu are contacted in addition to the hosts listed above.
The static library implementing this backend.
The shared library implementing this backend (present on systems
that support dynamic loading).
This environment variable specifies the list of directories that
may contain the configuration file. Under UNIX, the directories
are separated by a colon (`:'), under OS/2, they are separated
by a semi-colon (`;'). If this variable is not set, the config-
uration file is searched in two default directories: first, the
current working directory (".") and then in /etc/sane.d. If the
value of the environment variable ends with the directory sepa-
rator character, then the default directories are searched after
the explicitly specified directories. For example, setting
SANE_CONFIG_DIR to "/tmp/config:" would result in directories
"tmp/config", ".", and "/etc/sane.d" being searched (in this
A colon-separated list of host names or IP addresses to be con-
tacted by this backend.
Number of seconds to wait for a response from the saned server
for the initial connection request.
If the library was compiled with debug support enabled, this
environment variable controls the debug level for this backend.
E.g., a value of 128 requests all debug output to be printed.
Smaller levels reduce verbosity.
If saned has timed out, the net backend may loop with authorization
sane(7), saned(8), sane-dll(5), scanimage(1)
David Mosberger and Andreas Beck
14 Jul 2008 sane-net(5)
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